python替换字符串忽略新lin

Question

例如

str="dddabc
d
e
xxxx
123
345"

，要将"abcde"替换为null。 新的str需要

"ddd
xxxx
123
345"

最简单的方法是什么？你知道吗

如果我删除新行，新字符串将是dddxxxx123345，这是错误的

这需要在linux上，所以它\r\n可能

Answer 1

使用正则表达式^{}

Return the string obtained by replacing the leftmost non-overlapping occurrences of pattern in string by the replacement repl. If the pattern isn’t found, string is returned unchanged. repl can be a string or a function; if it is a string, any backslash escapes in it are processed.

import re
st="""dddabc
d
e
xxxx
123
345
"""
rep="abcde"
print(re.sub(r'\n?'.join(rep),r'',st))

输出

ddd
xxxx
123
345

Answer 2

使用regex如下：

new_str = re.sub('a(\s)*b(\s)*c(\s)*d(\s)*e(\s)*', "", str)